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after I forgot to turn it off for one day. it will not turn on. I tested the power supply. it is good, 16v. power will go to the main board. have any one tried to fix the similar problem. any lead or head up will be appreciated.

My guess is some electrical/lightning spike occurred when it was left plugged in. Always use a good surge suppressor on electronic equipment. Most electronic keyboards have a factory reset/initialize. Don't know if your PX has that(look in the owner's manual) if so try that.